Abstract
The concept of a spatial-velocity hodograph is introduced to describe quantitatively the extrusion of a carbon tubule from a catalytic particle. The conditions under which a continuous tubular surface can be generated are discussed in terms of this hodograph, the shape of which determines the geometry of the initial nanotube. The model is consistent with all observed tubular shapes and explains why the formation process induces stresses that may lead to "spontaneous" plastic deformation of the tubule. This result is due to the violation of the continuity condition, that is, to the mismatch between the extrusion velocity by the catalytic particle, required to generate a continuous tubular surface, and the rate of carbon deposition.
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Dates
Type | When |
---|---|
Created | 18 years, 10 months ago (Oct. 5, 2006, 8:01 p.m.) |
Deposited | 1 year, 7 months ago (Jan. 12, 2024, 4:56 p.m.) |
Indexed | 2 weeks, 4 days ago (Aug. 6, 2025, 8:47 a.m.) |
Issued | 31 years ago (July 29, 1994) |
Published | 31 years ago (July 29, 1994) |
Published Print | 31 years ago (July 29, 1994) |
@article{Amelinckx_1994, title={A Formation Mechanism for Catalytically Grown Helix-Shaped Graphite Nanotubes}, volume={265}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.265.5172.635}, DOI={10.1126/science.265.5172.635}, number={5172}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Amelinckx, S. and Zhang, X. B. and Bernaerts, D. and Zhang, X. F. and Ivanov, V. and Nagy, J. B.}, year={1994}, month=jul, pages={635–639} }